Rishi Sharma
Last Activity: 4 Years ago
Dear Student,
Please find below the solution to your problem.
(i) the basic character of hydrides decreases as follows:
NH3 > PH3 > AsH3 > SbH3 > BiH3
all hydrides of group 15 element possesses a lone pair of electrons on central atom and thus behave as lewis bases..
NH3 is basic and forms salt with strong and weak acids...
PH3 is a very weak base(may even be regarded as neutral)and thus forms salt with anhydrous hydrochloric acid gas...
AsH3,SbH3 and BiH3 are not at all basic...
the reason for such trend is : as the size of central atom increases..
the lone pair of electron occupies a larger volume ..
(ii) Due to inert pair effect, as we move down the group stability of pentahalides decreases.
So order isP > Sb > As > Bi for given X andF > CI > Br for given element because as size of halide increases, steric hinderance increases and molecule become unstable.
(iii)
Nitrogen not show allotropy due to its weak N-N single bond.
Therefore ability of nitrogen to form polymeric structure is less.
Thanks and Regards